Arroyo Tamarock AT LT285/55R20

Shop the Arroyo Tamarock AT 285/55R20 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.

What 285/55R20 means

In the size 285/55R20, 285 is the section width in millimeters (11.22 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 156.8 mm (6.17 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 32.34 inches, turning roughly 624 revolutions per mile. Overall diameter is what matters for speedometer accuracy and clearance when you change sizes, so compare it — not just the width — against your current tire.

The manufacturer lists the overall diameter of this specific tire as 20 inches — when clearance is tight, go by the published figure rather than the nominal size math.

The service description on this tire decodes to a load index of 122 — a maximum load of 3,307 lbs per tire. The speed symbol S corresponds to a maximum sustained speed of 112 mph.

Load Range E corresponds to a 10-ply rating.

Specifications

Frequently asked questions

Will 285/55R20 tires fit my vehicle?

Check the size molded into your current tire's sidewall or the tire placard inside the driver's door jamb — if it reads 285/55R20, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 285/55R20 tire in stock to compare options.

What does 122S mean on the Arroyo Tamarock AT?

122S breaks down as load index 122 — rated for 3,307 lbs per tire — with an S speed rating, good for a maximum sustained 112 mph.

What kind of tire is the Arroyo Tamarock AT?

The Arroyo Tamarock AT in 285/55R20 is a all terrain tire.

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